Constantine II AE3/4.  

obv: CONSTANTINVS MAX AVG, diademed draped bust right 
rev: GLORIA EXERCITVS, two soldiers standing with spears 

and sheilds to either side of a standard topped with 

Chi-Rho symbol, ASIS(crescent) in ex.	


There is some controversy about this type, that both Constantine 
   and Constantine II used this type and inscriptions. This 
   particular coin, however, has a portrait that is clearly Constantine II's.

Image by Tom Wood.